Graphene-based composite negative electrode material and preparation method thereof
A negative electrode material, graphene-based technology, applied in the field of graphene-based composite negative electrode materials and its preparation, can solve the problems of unstable structure, low specific capacity, low tap density, etc., achieve good adhesion and reduce specific surface area , the effect of thin coating thickness
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Embodiment 1
[0036] The preparation method of the graphene-based composite negative electrode material of the present embodiment comprises the following steps:
[0037] (1) To 1000mL of graphene oxide dispersion with a concentration of 10mg / mL, add 5mL of hydrogen peroxide with a mass fraction of 10% and 0.375g of pyrrole and mix evenly, then add 3.75g of methyl orthosilicate material and mix evenly , to get a mixed solution;
[0038] (2) Put the mixed solution in step (1) in a high-pressure reactor and conduct a hydrothermal reaction at 180°C for 6 hours. After cooling, filter, dry, and press into tablets, and then heat up to 850°C in an argon atmosphere for carbonization for 3 hours. , and then naturally cooled to room temperature to obtain a nitrogen-doped graphene and silicon dioxide composite material;
[0039] (3) Dissolve 1g of polyvinylpyrrolidone in 100mL of twice-distilled water and disperse evenly to obtain a solution of polyvinylpyrrolidone; dissolve 1g of polystyrenesulfonic ...
Embodiment 2
[0042] The preparation method of the present embodiment comprises the steps:
[0043] (1) To 1000mL of graphene oxide dispersion with a concentration of 5mg / mL, add 1mL of hydrogen peroxide with a mass fraction of 30% and 0.25g of melamine and mix evenly, then add 2.5g tetraethyl orthosilicate material and mix evenly , to get a mixed solution;
[0044] (2) Put the mixed solution in step (1) in a high-pressure reactor and conduct a hydrothermal reaction at 180°C for 6 hours, after cooling, filter, dry, press into tablets, and then carbonize in an argon atmosphere, wherein the carbonization conditions are : Raise the temperature at a rate of 5°C / min to 550°C for 2 hours, then raise the temperature to 850°C at a rate of 5°C / min and hold for 2 hours, then cool down to room temperature naturally to obtain a nitrogen-doped graphene and silicon dioxide composite material ;
[0045](3) Dissolve 0.1g of polyvinylpyrrolidone in 100mL double distilled water and disperse evenly to obtai...
Embodiment 3
[0048] The preparation method of the present embodiment comprises the steps:
[0049] (1) To 1000mL of graphene oxide dispersion with a concentration of 20mg / mL, add 20mL of hydrogen peroxide with a mass fraction of 1% and 0.67g of urea and mix evenly, then add 6.7g of propyl orthosilicate material and mix evenly , to get a mixed solution;
[0050] (2) Put the mixed solution in step (1) in a high-pressure reactor and conduct a hydrothermal reaction at 180°C for 6 hours, after cooling, filter, dry, press into tablets, and then carbonize in an argon atmosphere, wherein the carbonization conditions are : The temperature was raised to 850°C for 2 hours at a heating rate of 5°C / min, and then naturally cooled to room temperature to obtain a nitrogen-doped graphene and silicon dioxide composite material;
[0051] (3) Dissolve 10g of polyvinylpyrrolidone in 100mL of twice-distilled water, and disperse evenly to obtain a solution of polyvinylpyrrolidone; After uniform dispersion in d...
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